Improved chisel-holder for file-cutting machine



vWILLIAM J. BIRDSALL, 0F NEWARK, NEW JERSEY.

Letters Patent No. 97,030, dated November 23, 1869.

-00H r IMPROVED CH-ISEL-HOLDER FOR FILE-CUTTING- MACHINE.

The Schedule referred to :in these Letters Patent and making part of thesame.

I, WILLIAM J. BIRDSALL, of the city of Newark, in the county of Essex,and State of New Jersey, have invented cert-ain Improvements in Holdersfor Chisels in Machines for Cutting Files, of which the following is aspecification.

My invention relates to the manuel' of securing the chisel in theholder, and to the ina-nner of keeping cert-ain parts ot' the holdertogether, so as to prevent their being liable to be. jarred loose bytheir work.

The top of the holder is shown, in full size, in lFigline 1, and theunder side in Figure 2.

Figure 3 is a side and an end View of a semicircular block, that ismovable in the interior of the holder.

Figure 4 is an end view of the holder, showing the place and position ofthe semicircular block and the chisel.

Figure 5 is a side View, showing cach separate piece of the entireholder in its relative position.

Figure (5 is a horizontal view of the eccentric, the intermediate, and asection oi' the chisel.

Figure 7 is a fiat and edge View of the springs that secure theseniicircnlar to the other part of the holder.

Ihe outer case A cncloses the semic-ircular block B, the two tt-ingnicely together, so that the block can turn freely in the case, thesprings d pressing on the cent-re line of the semicircular block B,bythe edges e.

'.lhe chisel c passes through the senlicircularblock, and is held firmlytherein by the intermediate b, which is held tight thereto by theeccentric e.

The upright shaft f, turning in bea-rings in the block B, has theeccentric c on its lower end, and a leverhandle, g, on its top.

Attached to the semicircular block, with room to move where itpassesthrough the end of the case A, is a segment, h, that is shown as havingholes, but which can be a ratch, its object being the retention of thepressure which the eccentric gives to the chisel.

By reference to the patent, No. 79,878, July 14,

1868, issued to Messrs. Thurston and Kearney, in

which the present applicant has become a partner, it will be seen thatthe semicircular bloc-k was held t0 the case by screws, the under sideof the heads of the screws resting ou a curve, to'allow the turning ofthe semicircle in the case, and that the chisel was held to the block bya screw or screws. -Thc severe labor of the machine made it needful tofrequently renew or repair the loosened screws. 'Ihat annoyance Iobviatd by the above d'evices.

\Vhat I therefore claim, and desire to secure by Letters Patent, is-

1. Ihe combination of' the eccentric c, shaft f, intermediate l),lever-handle g, segment h, chisel a, and frame A, all constructed andarranged substantially as specified and shown. y

2. lhe combination of the springs d, semicircul'ar block B,'and frame A,in a tilecutting machine, in the manner and for the purpose shown.

. WILLIAM J. BIRDSALL.

Witnesses:

W. M. GOODING,

EDWARD GoLLvER.

